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Diamond ring effect. View of the diamond ring effect seen during a partial phase of the total solar eclipse which occurred on February 26th 1998. This effect may be seen for a few seconds just before or after the totality when only a tiny fragment of the solar disc is visible. The solar corona is visible as a green halo around the solar disc. It is a region of low density and temperature of about 1 million Kelvin. The solar corona is usually undetectable due to the overwhelming brightness of the inner region of the solar atmosphere known as the photosphere. Photographed from Aruba in the West Indies. (KEYSTONE/SCIENCE PHOTO LIBRARY/DAVID NUNUK)